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dan
Scilly.Suffolk
Tour magazine did a "wide racing tyres" test in 2014, which included Challenge PR and Conti GP4000S II (28mm), but not Vittoria Open Pave: Conti beat Challenge on every count.
PR was slower than even a 23mm GP, had the worst puncture protection of all tyres tested and Tour noted that "Tyre gives little feedback as regards grip limit and suddenly slips when over the limit."
I fitted OP last Autumn and haven't removed them: no punctures or serious cuts (lots of flint around here); the rear will need replacing soon.
#OPandlatex4lyfe